ZeniBot
Cipher
I think RUST is actually a decent tech - it works pretty well from a technical point of view, but I wish there was a medieval equivalent, like Reign of Kings, that could be taken a bit further than they did.
Bannerlord says watch this space me thinks. There's a few mods that if ported from Warband could easily be this. Persistent World for example if they allowed you to build what ever and where ever you wanted.